Test: LSAT Logical Reasoning

Yogurt aids digestion due to the bacteria that it contains. This is because the bacteria cultures are beneficial to human internal organs, allowing them to function more effectively. However, not all yogurts contain active bacteria cultures, and rather than being made purely with milk, use cornstarch and other additives in order to thicken them and give them the consistency of true yogurt. These yogurts cannot aid digestion.

1.

Which of the following, if true, most seriously weakens the argument?

It is the amino acids in milk-based yogurt that actually aid digestion, not the bacteria, which is produced as a byproduct. 

The bacteria found in yogurt can have negative health side effects if consumed in excessive quantities. 

Cornstarch has been found to aid digestion. 

Although rare, there are cases in which people have been completely unable to digest the bacteria found in yogurt. 

All yogurt contains bacteria, even in trace amounts. 

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